General Motors has issued a recall on 324,666 heavy duty diesel trucks, with the models being susceptible to short circuits, which in turn can create a fire risk for owners when they are out on the road.
The problem in question is isolated to models with the 6.6 liter Duramax engine that are equipped with the optional engine block heater. The recall technically does not deal with the heater itself, but rather, some of the wiring that helps connect the heater to the engine itself. According to an NHTSA report on the issue (campaign No. 19V328000) two spots in these connections are susceptible, with either the engine block heater cord or the terminals that link the cord to the heater being affected. A short circuit in either of these locations can damage engine components, and subsequently cause a fire. According to a separate report from the Detroit News, 19 fires connected to the problem have been reported, but thankfully, none of them have resulted in any injuries to truck owners.
The recall affects seven different truck models spread across three years, and they include the 2017-2019 Chevrolet Silverado 2500HD, 2017-2019 Chevrolet Silverado 3500HD, 2019 Chevrolet Silverado 4500HD, 2019 Chevrolet Silverado 5500HD, and 2019 Chevrolet Silverado 6500HD. It also includes 2017-2019 GMC Sierra 2500HD and 2017-2019 GMC Sierra 3500HD. As mentioned earlier, only models equipped with the 6.6 liter Duramax diesel engine and the optional engine block heater are affected, so expect the bulk of these trucks to be located in the snowbelt of the United States where the heater can be a useful tool on frigid winter days.
GM for its part has not figured out a formal fix for the issue as of this writing, and has thus not released a notification schedule for affected owners. In the meantime, if you suspect that your vehicle is part of the recall, contact GM customer service at 1-586-596-1733 and mention reference number N182206310